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f � <br /> ( crnnpacicd to at Icast 95 perccnt �1UD. Prior �n compaction, Ihc hackfill shouid hc moisturc <br /> conJi�ioncd to near optimum moisturc comcnt. if ncccssary. Thc backfill shnuld h: comp:icicd in <br /> Iaccordance��ith thc cri�cria discusscd aborc. <br /> 4.2.10 Drainage <br /> { All ground surfaces, pa�ements and siJc���alks should slope awa� from Ihe structures. Surtacc <br /> uatcr runoff sliould be rnntrolled bp a syslcm of curhs, bcmis,drainage s��:�lcs,and/or calch baxins, <br /> I and dischargc� into a stomi��;vcr collcction systcm. Roof dr;iins should hc tight-lined to dischargc <br /> into the stortnwater collection s�stem. <br /> l 4.3 FOUNDATION SU�PORT <br /> 1 4.3.1 General <br /> \'.'c recommend that the structure be supponed om m�ventional isola�ed and continuous sprcad <br /> � footines. To help mduce post-construction senlcment and bridEe over the soft nativc snils, footings <br /> throuehout Ihe strucmre should be underlain by properly compaded structural fill as discussed in <br /> r this section and in Section 4.'_. Tlie site should be prepared as discussed in Sections 4.2.2 and 4?.3. <br /> I The wuuitable soils in the non-preloaded arca and the loose/sofi soils in thc southwcst corncr of thc <br /> building footprint should be removed and mplaced �vi(h properly compacted sin�ctural fill. <br /> ( �Ye rccommend that the suberade soils below the footings be ovcre�cavated and/or <br /> re�ompacted to help reduce difiercntial settlemenu due to the variably compactcd fill at the site. <br /> IPor planning purposes,we recommend thal dtc foo[ing subgrade arcas be prepamd as follo��-s: <br /> 1. All footings located �n the old overburden fill that �vas prcloaded should be orerescavated at <br /> � Icast 3 fect below the bottom of ihe footings. Tlic exposed surface should be evaluated and iP <br /> suitable it should be compacted to at least 90 percent MDD, per ASTM D 1557. If the <br /> � subgrade soils are competent at [hat depUi, no additional overcac3vation will be necessary. If <br /> the subgrade soils arc not competent at an o��erexcavation depth of 3 feet, additional <br /> overexcava[ion ��ill be required. 7iie additional overeacavation can be deepened to a <br /> � maximum depth of 4 fect. The o��ere�cavation zone should extend at least 3 feet beyond all <br /> edges of the footings. The e�cavation should be backfilled with structural fill compacted to at <br /> Ieast 95 percent MDD. The footings that require this procedure include the west perimeter <br /> ( footing from A-]0 to A-12, north perimeter footing from A-12 to L-12, east perimeter footing <br /> from L-12 to L-I1, In addition, the following column footings should be prepared in this <br /> Imanner. (1) all column foot;ngs along gridlines 9, 10, 1 I, and 12 (ercept A-9, B-9, E-9, K-9, <br /> and L-9 to L-] 1, and (2) culumn footings at A-5 to A-8, B_5 to 3-S, GS to C-8. Colmnn <br /> footings should be overexcarated at Ieast 3 fect or%,the footing width,whichever is deeper. <br /> ' 2. All other footing excavations, whether perimeter or column,should be eaca��ated to the planned <br /> footing subgrade elevation and the exposed subgrade surface should bc recompacted to ai least <br /> I95 percent MDD per ASTM D I557. <br /> � <br /> � GcuEngineers �Z <br /> File No. 7584.(q2-W-t 1301050101 � �� <br />